Wildcards

Wildcards in Black Ops 2 are intended to mix things up. They extend and bend the system rules for class setups. Wildcards work like other class items in the sense that once you choose one, it takes up one of your available class slots.

Primary Gunfighter
Primary Gunfighter allows you to select a 3rd attachment for your Primary Weapon. In the past, we've been used to perks that allow the player to select a 2nd attachment, so it'll be extremely interesting to see what kind of combinations players will come up with now that we know Black Ops 2 will be providing them with the option to select a third.

Secondary Gunfighter
Secondary Gunfighter will allow you to select a 2nd attachment for your Secondary Weapon. In essence, it kind of works like Bling Pro from MW2.

Overkill
The Overkill Wildcard will act just Overkill perk from previous COD games. This will allow you to equip two primary weapons. My guess is that this will be extremely popular among players using the Assault Shield, as it could provide them with the opportunity to fire an AR via the hole in it's shield.

Danger Close
No, it's not the horrible perk that we saw in previous games. In Black Ops 2, Danger Close will allow you to select a second piece of lethal equipment. For example, if you wanted two semtex grenades or two battle axes, this would be a good choice.

Perk 1 Greed
Perk 1 Greed will allow you to pick a second perk from the first perk tier. So, if you want to use Ghost and Blind Eye together, this will be the right option for you.

Perk 2 Greed
Perk 2 Greed will allow you to select a second perk from the second perk tier. Could be used combine the perks "Toughness" and "Fast Hands".

Perk 3 Greed
Yep, you guess it. Perk 3 Greed will give you the ability to choose a second perk from the third perk tier.

Tactician
The Tactician Wildcard will allow to select a second piece of tactical equipment, AT THE EXPENSE of your lethal equipment. i.e. If you decide that you want a second stun grenade, you'll have to give up your lethal equipment.